Antenna device and electronic apparatus using it

摘要

An antenna device includes a ground conductor, a radiation conductor having a feed point, and a guard conductor that is insulated from the ground conductor and is disposed at a position that is closer to a specific site of a user than the radiation conductor in one use form and is such a position that at least part of the guard conductor overlaps with a place where the intensity of an electric field radiated from the radiation conductor is high.

主权项

1. An antenna device comprising:
a ground conductor; a radiation conductor configured to have a feed point; and a guard conductor configured to be insulated from the ground conductor and be disposed at a position that is closer to a specific site of a user than the radiation conductor in one use form and straddles one side of the ground conductor closest to the feed point or a virtual extended line of the one side; wherein the guard conductor is disposed at such a position that the guard conductor does not overlap with the feed point and at least part of the guard conductor overlaps with one of a first area in vicinity of an open end of the radiation conductor, a second area in vicinity of a virtual point resulting from symmetric displacement of the open end with respect to the feed point, and a third area sandwiched between the first area and the second area.